Alley in Pisa, Italy

by Lars Kotthoff

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I bought a fisheye converter some days ago. Now, I am unsure if such a converter should create a clear image if I look with my eye straight through it. I found a video on youtube with the hint that one could see something through a converter.

I cannot see through the converter I have here sharply. Everything is blurry. Is that correct or should I return the converter?

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Why do you care? What's it like when you attach it to your camera and take photographs with it? –  Poldie Aug 29 '13 at 21:32
    
I care, because the photos are not that perfect. Concrete: Nothing is realy focused. I thought it could be a bad device or similar. –  Christian Wolf Aug 30 '13 at 7:59

1 Answer 1

up vote 1 down vote accepted

Since a "fisheye converter" would have to deform the image that is being presented to the lens, I would expect that looking through it should NOT be undeformed. The entire point of the element is to cause a deformation curving the image into a more spherical shape.

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Hi, thanks, but I think we spoke from tweo different things: Yes the image MUST be deformed. All right. The question is has it to be sharp or blurry (unfocused)? –  Christian Wolf Aug 30 '13 at 7:57
    
@ChristianWolf - ah, ok, I would expect that to depend on viewing position. Lenses like that work by producing a virtual image at a fixed distance based on the distance to the subject (that way focusing still works through a range). It may very well be blurry depending on the optics, the best bet is to try it out on the camera and see if it is still blurry or not. –  AJ Henderson Aug 30 '13 at 13:56

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